{"joe":"male"}

http://genderizer.herokuapp.com?name=jo

{"jo":"female"}

http://genderizer.herokuapp.com?name=jamie

{"jamie":"mostly_female"}

http://genderizer.herokuapp.com?name=jaime

{"jaime":"andy"}

http://genderizer.herokuapp.com?name=joan

{"joan":"female"}

http://genderizer.herokuapp.com?name=kelly

{"kelly":"mostly_female"}

http://genderizer.herokuapp.com?name=lucy

{"lucy":"female"}

BONUS: http://genderizer.herokuapp.com/?name=jaime&country=ireland

{"jaime":"male"}

Heroku's free tier, not nearly as overloaded right now, but still. Source here: https://github.com/rajington/genderizer